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Written by Joe Evans, Ph.D.
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Pumps & Systems, April 2007
You have probably noticed that there are several camps out there when it comes to centrifugal pump applications involving variable frequency drives (VFDs). One group believes that every pump should have one, while another thinks that they should be banned altogether. And, of course, there is the middle ground that says it depends upon the pump and application.
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Written by Yuri Zhazanov, P.E., InCheck Technologies Inc.
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Pumps & Systems, August 2007
With the wide use of variable frequency drives in the pump industry and increasing unit size, it is becoming more difficult to design mechanical systems free from natural frequencies within operating speed range. If such an occurrence is allowed in the field, a resulting resonance condition threatens to significantly impact performance and longevity of the equipment.
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Written by Todd Reeves, Emerson Process Management
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Pumps & Systems, August 2007
Even when a redundant pumping system is in place, it can be advisable to monitor the condition of the operating units in critical applications where maintaining production depends on motor-pump reliability.
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Written by Rex Noble, P.E., FPL Services, LLC
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Pumps & Systems, May 2008
Under an Energy Conservation Performance Program, Miami-Dade County commissioned a study to evaluate potential capital improvement projects fully funded from the projected savings in energy consumption and/or operating and maintenance costs. Through this program, the cost of new equipment is financed through energy and/or other realized operational cost savings. The capital funding otherwise required to replace existing mechanical systems is avoided, and those funds can then become available for other County needs.
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Written by Renard Klubnik, Wilcoxon Research
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Pumps & Systems, June 2007
Cavitation is a destructive condition that can destroy the inside of a pump before you even realize it is occurring. Early detection can minimize damage, reduce downtime, and save money. Cavitation involves the creation of bubbles formed when the fluid being pumped vaporizes due to a decrease in pressure as the fluid enters the pump. These bubbles are then acted on by the pump impeller, causing them to implode.
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